The fresh ventral articular surface carries two convex surfaces split up from the an effective concave epidermis

The fresh ventral articular surface carries two convex surfaces split up from the an effective concave epidermis

5.2.thirteen Squamosal

Brand new morphology and sideways against orientation of your squamosal is extremely like aetosaurs including S. robertsoni, An effective. ferratus, P. andressorum, and you will D. spurensis (Shape 4u, v; Walker, 1961 : fig. 2; Quick, 2002 : fig. 2; Schoch, 2007 : fig. 8; Schoch & Desojo, 2016 : fig. 4). New oddly-formed squamosal (referred to as “sword-like” having An excellent. ferratus because of the Schoch, 2007 ) versions brand new posterodorsal margin of your own supratemporal fenestra. T. ruthae even offers a good laterally mainly based squamosal; although not, R. callenderi and you can aetosaurs do not have the noticable ventral projection found in you to definitely taxon (Ezcurra mais aussi al., 2017 ).

The brand new squamosal bears around three techniques, an prior techniques, an effective posterodorsal processes, and a good posteroventral procedure. The fresh new mediolaterally narrow anterior procedure ‘s the biggest of your own three and articulates ventrally on the quadratojugal, forms a small portion of the posterodorsal margin of one’s lateral temporal fenestra, and you will articulates dorsally towards the posteroventral side of the fresh new postorbital. A lateral ridge for the dorsal portion of the squamosal bounds the fresh new supratemporal fenestra laterally and you can continues anteriorly onto the dorsolateral margin of the postorbital. A tiny anteriorly leading apex of your prior procedure for the new squamosal underlies a beneficial posterodorsal projecting prong of your own dorsal means of the latest jugal. That it get in touch with excludes new postorbital out-of participation on margin from this new infratemporal fenestra as stated before, similar to the symptom in P. kirkpatricki (Weinbaum, 2011 ), and other regarding condition in aetosaurs (e.grams., P. andressorum, Schoch & Desojo, 2016 ). A small position towards the anteroventral facial skin of your anterior techniques fits a finer dorsal means of new quadratojugal.

The posterior part of the squamosal expands posterior to the head of your own quadrate and you will divides to the a good posteroventral and an anterodorsal process. Your face of quadrate suits towards the a definite ventrally facing fossa you to extends onto the anterior an element of the posteroventral techniques (Contour 4v); therefore, the new posteroventral procedure and the lateral edge of the articulation facial skin covers the head of your own quadrate away from lateral have a look at. At exactly the same time, towards posteroventral osal, there can be an apartment, posteriorly up against bookshelf that welcomes the slim anterodorsal margin of one’s quadrate. The new posterior epidermis of one’s posteroventral procedure enjoys a little element one to articulates to your paroccipital procedure for the new opisthotic (Contour 4v). In the place of extremely archosauriforms, this facet are thickened mediolaterally and round with the a dick comparable on the symptom in T. dabanensis (IVPP V3237) and you will aetosaurs (Nesbitt, 2011 ). The latest posterodorsal techniques contains a beneficial slit to your its rear boundary you to matches the newest posterolateral means of the fresh parietal.

Among the skeleton of palate, the fresh new vomers are not approved away from people identified sample. Yet not, this new ectopterygoid, pterygoid, and you will palatine was preserved from inside the PEFO 34561 and you will an extra ectopterygoid is famous (PEFO 33857); the latest palate is finished however, obscured within the PEFO 34089 (Figure three-dimensional).

5.2.14 Pterygoid

Whether or not not one are completely preserved (Figure 5a), the fresh pterygoid consists of the brand new prior process, horizontal techniques, and you will rear processes. The brand new prior process is triangular during the cross-point with a tall dorsal ridge one spells out the fresh function at the new midline. The ventral skin from the process try concave. They tapers anteriorly however the exposure to the new palatine is unfamiliar. The fresh lateral procedure contains a beneficial posteriorly pointed wing you to slopes posteroventrally. The fresh lateral part of the ventral body and it has a big facet across the entire period of brand new lateral process that articulates having the newest dorsal epidermis of ectopterygoid (Shape 5a). The newest pterygoid person is a thin, vertically based blade. The new ventral surface carries a circular anteroposteriorly founded ridge one continues on on the anterior procedure. Pterygoid pearly whites is actually absent. The newest posterior processes (= quadrate process) is actually broken-in every specimens (elizabeth.g., PEFO 34561) rear to your articulation area on the partial-round fossa to the basipterygoid procedure of new parabasisphenoid. The new anteroposterior period of the newest pterygoid is a lot like you to definitely inside archosauriforms such as for instance Erythrosuchus africanus (Gower, 2003 ) and you can P. kirkpatricki (TTU P-9000), rather than the anteroposteriorly abbreviated pterygoids out of aetosaurs (elizabeth.grams., L. meadei, TMM 31185-98; Neoaetosauroides engaeus, PVL 5698).

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